Put your knowledge and skills to the test with the case of Mr. R, a 19 year old, who presented to the ER with mutism, reduced oral intake, and ‪catatonia‬. His family tell you that these symptoms gradually developed over the last month after Mr. R began using a synthetic cannabinoid called "Spice".

Mr. R has no past psychiatric history, although there have been new psychosocial stressors in his life recently. Mr. R has used marijuana in the past and experienced paranoia while using this substance.

What investigations would you order? How would you treat this patient?